Proper noun
English Wikipedia has an article on:Chrysanthemum ThroneWikipedia
the Chrysanthemum Throne
(metonymically) The Japanese monarchy.
Naruhito will ascend to the Chrysanthemum Throne next May following the planned abdication of Emperor Akihito, who will step down after three decades at the helm of the world’s oldest imperial family. Source: Internet
Upon the abdication of Akihito, his oldest son Crown Prince Naruhito will assume the Chrysanthemum Throne. Source: Internet